Field Average Over a Dynamic Mesh

tecmul · November 27, 2018, 16:12

Hello,

I've implemented temporal averaging of my velocity field with the function object fieldAverage in the controlDict file. Am I correct in assuming that the function is averaging cell values over time, not domain points? This would be a problem as the cell centers move with time.

What I want is to average the velocity field at each point in the domain over time. Do I have to map the velocity field of the dynamic mesh to an underlying static mesh at each time step and then average that? Is there a simpler method? Any help would be appreciated.

tecmul · January 1, 2019, 13:40

self bump....

tecmul · April 24, 2019, 04:30

For anyone else facing this problem, there's a simple, albeit not perfect, solution with Paraview. The "resample to image" filter enables the mapping of a dataset to another mesh. Use this filter to map your data to a static grid, then implement temporal averaging. A better solution would be to something similar at runtime so all time steps are available for averaging, so if anyone has any ideas on how to do that, feel free to comment.

November 27, 2018, 16:12	Field Average Over a Dynamic Mesh	#1
tecmul Member Join Date: Sep 2018 Posts: 53 Rep Power: 7	Hello, I've implemented temporal averaging of my velocity field with the function object fieldAverage in the controlDict file. Am I correct in assuming that the function is averaging cell values over time, not domain points? This would be a problem as the cell centers move with time. What I want is to average the velocity field at each point in the domain over time. Do I have to map the velocity field of the dynamic mesh to an underlying static mesh at each time step and then average that? Is there a simpler method? Any help would be appreciated. Last edited by tecmul; November 27, 2018 at 18:18.

April 24, 2019, 04:30		#3
tecmul Member Join Date: Sep 2018 Posts: 53 Rep Power: 7	For anyone else facing this problem, there's a simple, albeit not perfect, solution with Paraview. The "resample to image" filter enables the mapping of a dataset to another mesh. Use this filter to map your data to a static grid, then implement temporal averaging. A better solution would be to something similar at runtime so all time steps are available for averaging, so if anyone has any ideas on how to do that, feel free to comment. serles, s1291, a.abadani and 1 others like this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
how to set periodic boundary conditions	Ganesh	FLUENT	15	November 18, 2020 06:09
decomposePar problem: Cell 0contains face labels out of range	vaina74	OpenFOAM Pre-Processing	37	July 20, 2020 05:38
''unknown radialModelType type Gidaspow'' PROBLEM WITH THE BED TUTORIAL	AndoniBM	OpenFOAM Running, Solving & CFD	2	March 25, 2015 18:44
dynamic Mesh is faster than MRF????	sharonyue	OpenFOAM Running, Solving & CFD	14	August 26, 2013 07:47
Problem with rhoSimpleFoam	matteo_gautero	OpenFOAM Running, Solving & CFD	0	February 28, 2008 06:51

January 1, 2019, 13:40		#2
tecmul Member Join Date: Sep 2018 Posts: 53 Rep Power: 7	self bump....